Re: [PHP] Random data loss.
2wsxdr5 wrote: With out posting any code I was wondering if anyone here has been experiencing this kind of problem. I have a standard web from that PHP code then reads and saves the data into a MySQL DB. The problem is some of my users have had data lost somewhere in this process. The web site is www.thewishzone.com. It is a wish list site and the data that seems to be getting lost is the price of an item a user adds to their wish list. I can't seem to duplicate it here. However one user did have it happen twice in a short time period. They enter a valid price and after the record posts the price goes to zero. Any ideas? How do you determine a valid price? Do you allow the $ to be in it? Cuz MySQL sure won't take that. Very common mistake. Are you checking mysql result for error in your INSERT and UPDATE statements. MySQL should not be losing data without SOME kind of message... -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Random data loss.
I think I need to give more details. The data loss happens somewhere
between the form post button press and the data being inserted into the
DB. It is a simple sql insert statement on a table with auto increment
keys. The price should be entered as a floating point number and that
is what my user who had the problem happen did. 34.72 in one case. The
price that ended up in the DB was zero. I tried to see if maybe there
was a mistake by putting in two periods but that just makes it store
34.00 instead. I tried spaces around the numbers and that didn't have
any effect. In every case where this has happened the user was able to
use the web form for modifying the data and changed the price back, post
the form which then executes an update sql statement and that corrected
the data.
The only thing I can think might be the cause is the data is actually
stored in 2 tables. The first table, Gift, stores the basic
information about the Gift you want and the second table, Vendor,
stores the information about where to get it as well as the price. I am
including the the queries below. A quick not the Gift table is a double
key table on UserKey and GiftKey and the Vendor table is a triple key
table on UserKey, GiftKey and VendorKey. It was set up this way to
allow a one to many relationship between Gift and Vendor, however at
this time the relationship is always a one to one.
$query = INSERT INTO Gift Values \n('$UserKey', NULL, '$Description',
'$Qty', '0',\n;
$query .= '$Manufacturer', '$ModelNum', '$InfoURL', '$ImageURL',
'$Category',\n;
$query .= '$Priority', '$AddDate', '$ExpireDate'\n);
$result = mysql_query($query);
if(! $result){
$ErrorMsg = I'm sorry, there was a database error, please try again
later.BR\n . mysql_error();
include 'AddGiftForm.php';
exit;
}
$GiftKey = mysql_insert_id($link);
$query1 = INSERT INTO Vendor Values \n('$UserKey', '$GiftKey', NULL,
'$Price', '$VName', '$VURL',\n;
$query1 .= '$VStreetAddress', '$VCity', '$VState', '$VZIP', '$Phone');
$result = mysql_query($query1);
if(! $result){
$ErrorMsg = I'm sorry, there was a database error, please try again
later.BR\n . mysql_error();
include 'AddGiftForm.php';
exit;
}
Chris W
Gift Giving Made Easy
Get the gifts you want give the
gifts they want this holiday season
http://thewishzone.com
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Random data loss.
With out posting any code I was wondering if anyone here has been experiencing this kind of problem. I have a standard web from that PHP code then reads and saves the data into a MySQL DB. The problem is some of my users have had data lost somewhere in this process. The web site is www.thewishzone.com. It is a wish list site and the data that seems to be getting lost is the price of an item a user adds to their wish list. I can't seem to duplicate it here. However one user did have it happen twice in a short time period. They enter a valid price and after the record posts the price goes to zero. Any ideas? Chris W Gift Giving Made Easy Get the gifts you want give the gifts they want this holiday season http://thewishzone.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Random data loss.
Could be a problem of multiple update modules for the same table. When I've encountered this problem in the past it's been one of two causes. 1. In the process of maintaining the table one routine that has no price information, retrieves the row and notices that the something needs to be changed, and instead of only updating columns that have changed it seeks to update all of them (perhaps satisfying one programmers sense of order), and since it has no price info, it replaces the price with zero (good rule IMHO; only update columns that you know need to be changed). 2. Update queries that did not specify all the appropriate where clauses, thereby updating multiple rows, and perhaps in this case updating with zero prices (perhaps contributed to by coding all elements as above). (a rule that I apply to myself, not necessarily quite as good as the previous rule, use artificial keys [auto increment fields] and update with unique [or a list of] artificial key in the where clause). One nice thing about auto increment primary keys is they are self locking in that no two insert rows can get the same artificial key, even if the insert occurs at the same time (at least in MySQL). Take a look at the text in your actual queries and read them over and over, the answer is there. Don't consider this an exhaustive list, there are lots of people out there more clever than I coming up with new ways to loose data every day. But this is where I would start. Hope this helps, Warren Vail -Original Message- From: 2wsxdr5 [mailto:[EMAIL PROTECTED] Sent: Monday, December 06, 2004 4:27 PM To: [EMAIL PROTECTED] Subject: [PHP] Random data loss. With out posting any code I was wondering if anyone here has been experiencing this kind of problem. I have a standard web from that PHP code then reads and saves the data into a MySQL DB. The problem is some of my users have had data lost somewhere in this process. The web site is www.thewishzone.com. It is a wish list site and the data that seems to be getting lost is the price of an item a user adds to their wish list. I can't seem to duplicate it here. However one user did have it happen twice in a short time period. They enter a valid price and after the record posts the price goes to zero. Any ideas? Chris W Gift Giving Made Easy Get the gifts you want give the gifts they want this holiday season http://thewishzone.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Random data loss.
2wsxdr5 wrote: With out posting any code I was wondering if anyone here has been experiencing this kind of problem. I have a standard web from that PHP code then reads and saves the data into a MySQL DB. The problem is some of my users have had data lost somewhere in this process. The web site is www.thewishzone.com. It is a wish list site and the data that seems to be getting lost is the price of an item a user adds to their wish list. I can't seem to duplicate it here. However one user did have it happen twice in a short time period. They enter a valid price and after the record posts the price goes to zero. Any ideas? pretty hard to tell with this information. What you might want to do, is to call the error_log() function with the insert query that is being executed. That way you will have a record of each query that has been executed. (if you have a software that can analyse your mysql binary log, it could serve the same purpose). You could then look at these queries to see if there is anything suspicious. You could also have a bit of code that tests the value of the price variable in each page and mail you all the env settings if price happens to be zero that way you would have a chance of reproducing the problem. Chris W Gift Giving Made Easy Get the gifts you want give the gifts they want this holiday season http://thewishzone.com -- Raditha Dissanayake. -- http://www.radinks.com/print/card-designer/ | Card Designer Applet http://www.radinks.com/upload/ | Drag and Drop Upload -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
